I don't think there's a difference between 120hz 3D and 120hz non-3D - I think it's the 120hz part that makes it 3D-compatible (and maybe some doohicky to converse with the glasses about which eye it's showing).

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there is. 3D monitors often take a 60Hz input, split it into 30FPS per eye, then double them.
so you really only get 30FPS per eye, and its craptastic.

true 120Hz monitors (of which some or many are 3D capable as well) actually allow you to set a 120Hz refresh rate in windows. HDTV's are the worst offenders for 60Hz inputs, while they advertise higher.

The problem isn't demand it's that companies just assume it won't be a significant selling point. Considering the ones that could manage it carried a very slight premium then even if the proper engineering doubled the circuit board cost it still would be a small price increase. The massive response/smoothness boost will offset the $20 cost increase. Even people who don't get it are conditioned to know 120 Hz = good from TV specs. It's prime time to capitalize on that.

The problem isn't demand it's that companies just assume it won't be a significant selling point. Considering the ones that could manage it carried a very slight premium then even if the proper engineering doubled the circuit board cost it still would be a small price increase. The massive response/smoothness boost will offset the $20 cost increase. Even people who don't get it are conditioned to know 120 Hz = good from TV specs. It's prime time to capitalize on that.

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In which case you should write to the marketing dept of (insert display manufacturer here).